30 SOLENODON PARADOXUS. 



of the condyle of the femur. It passes obhquely as a triangular muscle to insert 

 upon the postero-ental surface of the tibia just proximal to the origin of the 

 tibialis posticus. There is a large sesamoid in the tendon of origin, attached 

 by fibers between the heads of tibia and fibula. 



Tlie tibialis anticus (Plate 6, fig. 1, /() arises from the large shallow fossa 

 on the ectal side of the tibia and the adjacent portion of the fibula. The muscle 

 is triangular in section and becomes a strong fiat tendon distally, that passes to 

 the ental side of the foot through the same loop as the extensor longus digitorum. 

 It is inserted on the ento-lateral side of the base of the entocuneiform bone, not on 

 the rudimentary first metatarsal as in some mammals, e. g., the cat, or the meta- 

 tarsal of the first digit as in Gymnura, Potamogale, and apparently Centetes. 

 Dobson does not mention the connections of this muscle in Solenodon cubanus. 

 In S. paradoxus, however, this termination was carefully verified on both hind 

 feet. The inserting tendon is large and conspicuous and is inserted back from 

 the anterior edge of the bone. 



The extensor longus digitorum pedis (Plate 6, fig. 1, gf) is a very small nar- 

 row muscle, hardly 2 nun. in radial thickness, and less than that in superficial 

 breadth. Its origin is from the tendinous sheath covering the ectal aspect of 

 the condyle of the femur. Its tendon passes through a loop on the anterior 

 part of the ankle together with the tendon of the tibialis anticus, then 

 through a second loop enclosing the extensor alone, which here has broken 

 into four appressed thread-like branches, one to eacli of the digits, 2, 3, 4, and 

 5. The branch to digit 5 is inserted at the ental, the others on the tlorsal 

 aspect of their resj^ective digits. A similar arrangement is described for 

 Gymnura and Centetes. 



The peroneus longus (Plate 6, fig. 1,/) is very distinctly from two heads. 

 The first is from the tendinous sheath covering the external condyle of the 

 femur, continuous with the origin of the extensor longus digitorum. These 

 tendinous fibers pass across to the second and principal origin about the head of 

 the fibula. At a little more than one half the length of the tibia the muscle 

 passes into a slender tendon, which dips under a loop at the ectal side of the 

 ankle, then under a second loop on a prominence at the ecto-anterior portion of 

 the calcaneum. It then gives off a small branch to the base of metatarsal 5 

 and continues acro.ss the foot to the insertion into the base of metatarsal 1. In 

 Gymnura and Erinaceus europaeus it is merely inserted into the internal cunei- 

 form, but in E. jerdoni according to Dobson ('82-'90, p. 55) the branch to the 

 fifth metatarsal is also present. The insertion into the first metatarsal seems 



